The sentinel is a tall coniferous evergreen tree. It has grey-green needles, and produces a sweet, sticky sap from its trunk. Sentinels are found throughout much of Westeros: including the North, beyond the Wall, the Vale, the Riverlands, the Crownlands, and the Stormlands.
- A Game of Thrones, Prologue.
- A Game of Thrones, Chapter 2, Catelyn I.
- A Feast for Crows, Chapter 41, Alayne II.
- A Clash of Kings, Chapter 47, Arya IX.
- A Feast for Crows, Chapter 4, Brienne I.
- The Winds of Winter, Chapter , Arianne II.
- The World of Ice & Fire, The Stormlands: The Coming of the First Men.
- A Game of Thrones, Chapter 53, Bran VI.